Dear Sir/Madam,
According to the discussion thread in
https://groups.google.com/a/soe.ucsc.edu/forum/#!msg/genome/ClmwZbanI_g/m4tTqvuKxHoJ, "We generally update our RefSeq Genes track every day with new data from RefSeq". However, it seems that the refseq gene track has not been updated for two weeks until May 3rd, 2015. I a wondering if the update frequency has been reduced or it's just a one-time technical issue.
Also, in the latest update refseq gene track, there are some refseqs that have older verssions. For example, refseq NM_004537 is version 5 according to NCBI record (updated on Apr 17, 2015 03:11 PM and Apr 28, 2015 03:45 PM), in UCSC it's still in version 4 (last modified Mar 15, 2015 03:59 PM). It seems that UCSC refseq gene track is based on older version of NCBI refseq.
Thanks.
Xiaomao Zhu